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ON Semiconductor's stepper motor designs receive updates

Posted: 30 Sep 2008 ?? ?Print Version ?Bookmark and Share

Keywords:stepper motor design? SPI? MCU?

ON Semiconductor has extended its bipolar stepper motor control family to include two new SPI versions of a motor driver capable of peak currents up to 800mA and for use with an external MCU for added flexibility. The AMIS-30511 and AMIS-30512 eliminate the need for many external components, reducing system cost and BOM, claims ON Semiconductor.

Both of the new mixed-signal ICs contain two embedded H-bridges that can drive two-phase stepper motors with sustained peak currents up to 400mA and maximum currents up to 800mA for short duration. Each also allows a host MCU to detect blocked rotor and end-of-run conditions without additional switches, Hall sensors or optical encoders. In addition to stall detection, these functions allow the designer to program the MCU to calculate rotor position and to dynamically adjust current or speed as required to prevent step loss. This capability eliminates noise and vibration at end-stops and improves motion-control accuracy and reliability without additional components.

The 30512 contains a 5V regulator to supply both internal logic and up to 50mA for external components, such as a microprocessor. The 30512 also has watchdog logic circuitry to prevent an external microprocessor from "hanging up."

Typical uses for the 30511/512 include security cameras, building and industrial automation, motor control, textile processing, process equipment, robotics, HVAC and base station control and status.

Available in a 24-pin SOIC package, unit pricing in quantities of 1,000 starts at $3.81 for the AMIS-30511 and $4.18 for the AMIS-30512.

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